diff --git a/patchwork.md b/patchwork.md
index 8ebdd3df1..eee0c1131 100644
--- a/patchwork.md
+++ b/patchwork.md
@@ -208,3 +208,22 @@ Remove superfluous imports
 
 Hah, this is embarassing
 ```
+
+[TODO] [M3R1-01] Code has been applied, players still dont get achievments
+``` 
+f6160bdc57b3d9850607c2c7c2ce9734b4963478
+Fix players not getting advancements when they own turtles
+
+When we construct a new ServerPlayerEntity (and thus TurtlePlayer), we
+get the current (global) advancement state and call .setPlayer() on it.
+
+As grantCriterion blocks FakePlayers from getting advancements, this
+means a player will no longer receive any advancements, as the "wrong"
+player object is being consulted.
+
+As a temporary work around, we attempt to restore the previous player to
+the advancement store. I'll try to upstream something into Forge to
+resolve this properly.
+
+Fixes #564
+```
diff --git a/src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java b/src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java
index f68182c20..a0ddbe9b7 100644
--- a/src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java
+++ b/src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java
@@ -135,7 +135,7 @@ public interface ITurtleAccess {
      *
      * @return This turtle's owner.
      */
-    @Nonnull
+    @Nullable
     GameProfile getOwningPlayer();
 
     /**
diff --git a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
index e4327fe94..c1fdc2a5d 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
@@ -19,6 +19,7 @@ import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
 import com.google.common.base.Objects;
 import com.mojang.authlib.GameProfile;
@@ -341,7 +342,7 @@ public class TurtleBrain implements ITurtleAccess {
         }
     }
 
-    @Nonnull
+    @Nullable
     @Override
     public GameProfile getOwningPlayer() {
         return this.m_owningPlayer;
diff --git a/src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlayer.java b/src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlayer.java
index 41911b119..c644bb643 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlayer.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/core/TurtlePlayer.java
@@ -33,6 +33,7 @@ import net.minecraft.inventory.Inventory;
 import net.minecraft.item.ItemStack;
 import net.minecraft.screen.NamedScreenHandlerFactory;
 import net.minecraft.server.world.ServerWorld;
+import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.math.BlockPos;
@@ -42,13 +43,33 @@ import net.minecraft.util.math.Vec3d;
 @SuppressWarnings ("EntityConstructor")
 public final class TurtlePlayer extends FakePlayer {
     private static final GameProfile DEFAULT_PROFILE = new GameProfile(UUID.fromString("0d0c4ca0-4ff1-11e4-916c-0800200c9a66"), "[ComputerCraft]");
-
-    private TurtlePlayer(ITurtleAccess turtle) {
-        super((ServerWorld) turtle.getWorld(), getProfile(turtle.getOwningPlayer()));
-        this.networkHandler = new FakeNetHandler(this);
-        this.setState(turtle);
+// TODO [M3R1-01] Fix Turtle not giving player achievement for actions
+    private TurtlePlayer( ServerWorld world, GameProfile name )
+    {
+        super( world, name );
     }
 
+    private static TurtlePlayer create( ITurtleAccess turtle )
+    {
+        ServerWorld world = (ServerWorld) turtle.getWorld();
+        GameProfile profile = turtle.getOwningPlayer();
+
+        TurtlePlayer player = new TurtlePlayer( world, getProfile( profile ) );
+        player.networkHandler = new FakeNetHandler( player );
+        player.setState( turtle );
+
+        if( profile != null && profile.getId() != null )
+        {
+            // Constructing a player overrides the "active player" variable in advancements. As fake players cannot
+            // get advancements, this prevents a normal player who has placed a turtle from getting advancements.
+            // We try to locate the "actual" player and restore them.
+            ServerPlayerEntity actualPlayer = world.getServer().getPlayerManager().getPlayer(player.getUuid());
+            if( actualPlayer != null ) player.getAdvancementTracker().setOwner(actualPlayer);
+        }
+
+        return player;
+        }
+
     private static GameProfile getProfile(@Nullable GameProfile profile) {
         return profile != null && profile.isComplete() ? profile : DEFAULT_PROFILE;
     }
@@ -70,14 +91,17 @@ public final class TurtlePlayer extends FakePlayer {
     }
 
     public static TurtlePlayer get(ITurtleAccess access) {
-        if (!(access instanceof TurtleBrain)) {
-            return new TurtlePlayer(access);
-        }
+         ServerWorld world = (ServerWorld) access.getWorld();
+        if( !(access instanceof TurtleBrain) ) return create( access );
+
+         /*if (!(access instanceof TurtleBrain)) {
+            return new TurtlePlayer(world, access.getOwningPlayer());
+        }*/
 
         TurtleBrain brain = (TurtleBrain) access;
         TurtlePlayer player = brain.m_cachedPlayer;
         if (player == null || player.getGameProfile() != getProfile(access.getOwningPlayer()) || player.getEntityWorld() != access.getWorld()) {
-            player = brain.m_cachedPlayer = new TurtlePlayer(brain);
+            player = brain.m_cachedPlayer = create(brain);
         } else {
             player.setState(access);
         }